Verb use confusion?

Verb use confusion?
 

Hi all, My name is Carl and I'm teaching myself Spanish as I love travelling in the Spanish speaking world and need a new learning challenge! I've been at it on a slow self help basis for a couple of years. I'm nowhere near any kind of fluency but making progress and enjoying it.

I'm new to forums of any type so be gentle with me! :)

I have been using a book called 'Learn Spanish the Novel way' by Joe Schwartz. I like it but am confused by this sentence:

Yo solo hacen los ladrillos

In the context of the story, a young boy has forgotten to help his grandparents add a new room to their Mexico ranch; he says "(but) I only make the bricks" - that's my understanding?

I'm confused by the use of 'hacen' in what appears to be the 'yo' form of the verb. I can't see how that is correct in any of the conjugations I have found online?

Can anyone explain please?

Thanks
Carl

Hola, Carl. ¡Bienvenido a Tomísimo! Ya verá cómo lo pasa en grande aquí.

Esa oración carece de sentido debido a eso mismo que comentaba: yo sólo hago los ladrillos / ellos sólo hacen los ladrillos. Quizás se trate de una errata.

Y sólo hacen los ladrillos.

Un saludo cordial.

It's definitely an error. If the context is an excuse offered by the boy for not helping to build the new room the verb can only be "hago", not "hacen". :)

Gracias por ayudarme a ambos Julvenzor y Angélica De Alquezar.
Pienso estan es correcto. Sus respuestas tienen razon, debe lo ser una errata
Espero me lo dicho bien!!
Carl